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What Happens When You Faint?

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Why do we faint? Because sometimes, your nervous system just doesn’t know what to do with itself. Hosted by: Hank Green ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to Justin Ove, John Szymakowski, Fatima Iqbal, Justin Lentz, David Campos, and Chris Peters. ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow Or help support us by becoming our patron on Patreon: https://www.patreon.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow Sources: http://faculty.weber.edu/molpin/healthclasses/1110/bookchapters/stressphysiologychapter.htm http://intermountainhealthcare.org/ext/Dcmnt?ncid=520408204 http://circ.ahajournals.org/content/106/9/1048.full http://circ.ahajournals.org/content/113/16/e715.full http://www.ncemi.org/cse/cse0101.htm http://www.nhs.uk/Conditions/Fainting/Pages/Causes.aspx
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Text Comments (1907)
Brian Harvey Garcia (10 days ago)
I almost fainted during our PE Class, i even puked a couple of times
Didik Achmadi (14 days ago)
33 years old and i never pass out until 4 months ago. It was Sunday, lunch time and i'm about to eat, all of sudden i had this black out . My wife were panicking since she tried to wake me up but she couldn't. Couple of minutes later i regain my consciousness and my family took me to the emergency room, the doctor in charge evaluate my blood pressure, heartbeat rate, also took my blood for a lab test. The result, all was normal and they let me back home with 2 types of medicine. After watching this i guess everything is fine, just a non-serious faint with less oxygen carrying blood going on inside my brain.
tieme koenders (24 days ago)
i have a question can you faint from fear ?
RaccoonMoustache (24 days ago)
When you faint there’s black coming around your vision and everything starts to blur away, you can’t pay attention to anything and even when you never experienced it you KNOW that you’re gonna faint. It hurts your head more and more, you feel dragged down as it’s putting more pressure on your head, it’s really not comfortable, you have cold sweat and your head feels really weird. You lose control and you feel the urge to look around and distract yourself, trying to do something to think of something else, but you CAN’T. Then you just pass out and remember nothing of what happened during the time you faint. Then when you wake up you’re just like wtf happened and you really feel bizarre.
Norah Sessions (25 days ago)
I fainted today and was like “defuw jus happened...??”
TaylorAnd Graphite (26 days ago)
Talk about POTs
Vika Kika (29 days ago)
I just fainted for a sec because I stood up really fast and it's kinda hot
Elizabeth Everson (1 month ago)
Whenever I have my panic attacks I get lightheaded and dizzy. Everything turns black but I’m still standing. My head starts to hurt like someone is pushing down on it while my heart if beating really fast. I usually just close my eyes and fall against a wall. It happens a lot.
•KiingGus• (1 month ago)
One time I passed out in church and hit my head on the bench
Harazarr (1 month ago)
This happened to me today lol
BenCat07 (1 month ago)
I ALMOST fainted once, like i wasn't feeling very well and after i went out of our Living room I had this green vision which i sometimes get from getting up too fast (missing oxygen), shortly after i couldn't properly stand anymore and couldn't see, i fell right through our living room door made of glass, i didn't feel any pain or quite knew what happened, but i could still talk and hear, after like 2 minutes i noticed i smashed through the glass door and after 5 minutes i was Okay Again, Luckily my Mom was around and helped me by sitting me down in a Chair and also removing the glass all over the floor, i wasn't really injured i just had a little wound on my arm, but it was still not very pleasant
The Uhh Gals (1 month ago)
I fainted today...
Proud Atheist (1 month ago)
I’m 34 years old and never fainted in my entire life, I did experience something odd though, in 2011 or 2012 I had the feeling of falling while I’m sitting, it just happens in a fraction of a second but it feels like forever! Never had it standing up!
angie bittinger (1 month ago)
haha i fainted at my graduation
Ahmed Saad (1 month ago)
I can't faint the way i did before .
Amine Elazar (1 month ago)
I Kill People (1 month ago)
I faint every time I bust a nut
GeloVerse (2 months ago)
Literally happened to me today in bio class when i had to draw blood from my body. After that pricking i was okay until i was losing my eyesight and lost hearing.
My literal Husband (2 months ago)
I faint when i suddenly feel really hot, stress and forgetting to eat dinner and breakfast sad times
Mutt (2 months ago)
I fainted once when I got out of a hot shower and it lessened the oxygen I was getting bc of all the steam, so when you are about to faint, it feels like your body is getting heavier for your legs, your hearing gets muffled and you just, lose consciousness.
Mexikan Tovarish (2 months ago)
Unpleasant? I love it!
Blue Velvet (2 months ago)
1:03 Boom goes the dynamite
die (2 months ago)
I am so scared I almost fainted like 5 minutes ago. Ok storytime. So I got basically no sleep today and I am on my period. So I was in the shower and I was going to shave. The shaving cream package said to turn on the hottest water I could take for 30 seconds. So I did that and it was going good until my vision started getting blurry and I felt nauseous and I was cramping severely. So I got out and there was so much blood dripping down my legs. As my vision was blurry I turn the water back on and clean my legs. Then I go to see if my mom was home and she was and she helped me. It only lasted like 5 minutes but I was so scared and thought I was dying.
Elijah Killy (2 months ago)
I’m conscious when I black out I just can’t see anything but I’ll have a seizure while standing then get very disoriented then finally fall
Sasageyo is My name (2 months ago)
On time I stood up from my bed then my head starting hurting then I felt dizzy then just fell to the floor and blacked out for a few seconds then started shaking then woke up..
The Golden Tiger (3 months ago)
I've never fainted in my life but I had to rush to take my friend to the hospital in the morning so I didn't have anything to eat so with the amount of blood and low blood sugar made me almost faint.
vloging Boy (3 months ago)
when i was 5 we had to get are shots in school when i got my one i went back to my seat and then i woke up on the floor
Harzlibube (3 months ago)
I fainted about a year ago and it was pretty scary and i woke up crying. My dad was yelling at me and my vision started going blurry and i felt extremely dizzy and started swaying side to side and i couldn't stand up straight. Then I fell and hit my head on a cupboard and I heard the noise of me hitting my head and everything went black. I woke up and asked my mum how long I was out for and she said "30 seconds" but it felt like I was asleep forever.
Jona C (3 months ago)
Great info. Fainted 2x about a little more than 1 hour ago.
Crypto Addict (3 months ago)
This happened to me when I smoked too much weed, I over did it that time.. If you over do it, you will pass out as well. You will start to see black dots, then be blind for 15 min. Sound will be reduced, almost deaf. Feel really sweaty, yet so cold... Your muscles are all shut down, so you can't move. The only thing I was thinking during that moment was that I was about to die. Flashbacks through my mind about what I did in my life in those 15/20 minutes. A better way isn't there to describe :/
mkffin (3 months ago)
I faint/blackout alot, idk why... I will stand up or be walking 'anything' then this pain shocks in my head or the back of my kneck, then my vision goes blurry and i usally fall to the floor or have to hold onto something until, The pain goes away,please someone give me answers x
SirGivesAlout Gaming (3 months ago)
Who else is watching this straight after they fainted?
JT TUNAGE (3 months ago)
Has anybody stretched and hold your breath at the same time and black out and you have like a tiny dream or sum?
Lexi Kowalski (3 months ago)
I fainted at my lacrosse game and all my friends said I look green / blue.. my hands are usually like a whitish red and they where soooo white so I knew I was going to pass out and I couldn’t move them at all of my legs or stomach. Is it normal for my skin to look weird and not move my hands when I pass out ?
Cynthia Cabrera (3 months ago)
I want to faint before I die... Don't know why.😅😂😂
skinnypenis12 3 (3 months ago)
I've fainted 3 times today
skinnypenis12 3 (3 months ago)
Call me weird but I like to make myself faint
Snow flake (3 months ago)
When last time I fainted I feel like the noises get louder
Rudi Barczewska (3 months ago)
Why do you convulse when you faint though? Does it happen to everyone? I am tired of scaring the crap out of my friends
s w i f t (3 months ago)
Treatment please
ENEMYone365 (4 months ago)
I fainted this one time and woke up in this place where it was both dark and bright, I didn’t have a body but I was able to look around, and just like that I wake up, is that what happens when you faint?
I pass out 5 times in my life
FireFlie (4 months ago)
i fainted today and it was horrible bascily we was having some stuff injected into us after it was done a few mins later still sitting on this chair talking to someone i fell over and 30 seconds later i woke up everything was dark and this horrible noise was in my ears and my balance was tottaly off its a horrible feeling never want to feel it again
Conbro098 (4 months ago)
Happened to me twice it’s so cool
Elysha Nygaard (4 months ago)
this is why i pass out when i give blood lol. i always get made fun of since i have tons of tats
Rae Dai (4 months ago)
I wonder if you can explain why I don't just faint. When I faint I shake violently. The last time I did this I kicked my shoes off and gave myself whip lash. I only faint seeing or thinking about my own bodily functions like blood or pulse for too long. And no it isn't a seizure. I know that it's fainting I'm just curious why some people shake and some don't.
Alimo Eskimo (4 months ago)
I started to faint when the eye doctor dilated my eyes with eye drops. I was just waking around in the shopping center waiting for my prescription and I was like "LOL WOAAHH I CAaAnNT EVen focus my EYES HOW Weeird" and then next thing I know I was walking like a drunk driver and fell completely over. My mom helped get over somewhere and got the doctor but it was really weird. According to the doctor and a few other sources, some people have a crazy reaction the first time they get there eyes dilated. It's some kind of reflex. Afterward I didn't even want to eat the snickers my mom made me eat, I felt so sick and woozy, almost like my body was having a breakdown but I wasn't afraid or any thing.
ConnorConnor (4 months ago)
Once, I fainted on the toilet. Then I got into an ambulance.
ArtificialFeelings (4 months ago)
I've never fainted before. Is it scary because it seems like it
Stale Tips (4 months ago)
That's not a good thing your Involuntary Functions are volunteering for this.
Minus Mimik (4 months ago)
I faint all the time. I faint after almost all of my daily panic attacks, I faint if I stand up way to quickly, I faint if people mention the possibility of needing surgery, I faint when I get too stressed, I faint when I stretch in the morning, sometimes I faint when I walk through my doorway, I fainted when my mum took me to get a blood test to find out why I faint so much, I fainted after I won a round on an online video game, I fainted on the stairs cause it was raining. wwwwwhhhhhhhhhyyyyyyyyyyyyyyy does this happen to meeeeee!?
Veronica Vinaja (5 months ago)
I fainted after I just finished donating blood. I was walking towards the snacks. And had the urge to throw up and tried to drink a gatorade. Then I noticed everything darkening. Like tunnel vision and my hearing was coming and going. I look down to take a breath and then I fell over. The staff did a wonderful job at getting me on a seat to elevate my feet, and ice packs. They made sure to keep talking to me to keep me awake. I eventually calmed down and everything was back to normal. But I can't stop thinking about death now. I honestly could've died if my blood pressure didn't raise back up as fast as it did..
Keegan LeFevre (5 months ago)
When I fainted i was 15 and standing at a door. i was out for about half a minute. when i woke up the last thing i could remember was standing at the door. when i woke up i was on ground, and i hit my head hard.
No Name (5 months ago)
I faint about once to twice a day. I have problems with low blood sugars and blood pressure xD
Charlotte Linder (5 months ago)
This makes a lot of sense I fainted today after sucking a lot of helium.
Z- Pikabot (5 months ago)
I fainted in church because I’m kneeling, scary experience
Skye (5 months ago)
I fainted today, and it was NOT FUN!
KawaiiArtie Michelle (5 months ago)
I faint in school in Christmas concerts and I THINK it is there was too much people in the same room and it was too hot and its so embarrassing :(
Kawaii Jenevieve (5 months ago)
I fainted today
Andy Wright (5 months ago)
I fainted in Tesco wille getting douhnuts today and a man with first aid came running over but at least I saved $1-05 and I got to eat my tasty treat for free in my bed
Emma Wells (5 months ago)
I once passed out in church (went right over the pew) and then I just woke up in a classroom with coke being shoved in my face... it was great. Idk why i didnt do something cause i knew i was going to since i had before. OH WELL
Leong Birlis (5 months ago)
I fainted in my P.E. lessons after climbing 200 steps within a minute or two. I was taking a rest and trying to regulate my breathing. I even felt fine and cheered for my other classmates who were still doing it. Just then I started hearing 'wheee----' in my ears until I couldn't hear anything. I started to see black dots and they become bigger, then idk what happened. I guess I fainted. When I woke up, I was in a wheelchair with the school doctor XD I had a terrible headache after that which lasts for a day.
Delta Elite (5 months ago)
I don’t faint I just idk like black out and I can’t move when it happens
Spice 0o0 (5 months ago)
I fainted today 3-26-18 and it was bc my blood level was at 37 and dehydrated it felt like a black liquid was filling up in my eyes and it’s scary bc I got super hot and started sweating
REAG anics (5 months ago)
So it’s kinda like that nerve is telling ur body to “SHUT TF UP” and then it doesn’t listen so it just shuts us down and we reboot....... cool
Nombulelo Kubhayi (5 months ago)
I fainted today, in church and my wig fell off. when I came to.. a man handed me my wig and I put it back on before walking out of the church. Good times
jdjdjdd djdjdjdj (5 months ago)
Adrenal fatigue and dysautonomia
Momotaru -kun (5 months ago)
I’ve fainted numerous times over the last couple years I fainted again today I really thought I was going to die
AdrianAtGaming (5 months ago)
it happens after 11 pm or before sleeping
Luna (5 months ago)
Yeah so I fainted today for the first time after getting my blood drawn. I hadn't eaten enough so I ended up just falling over. Apparently I said I felt faint and asked to sit down but the next thing I knew, I was on the ground and there were 6 doctors around me asking if I was ok lol. It kind of just felt like I'd fallen asleep. It was the strangest feeling.
Kathii K (6 months ago)
I once fainted in school and no one noticed 🙃 I somehow managed to get up after a minute and tell my teacher that I don't feel too well 😅
Anime Chrox (6 months ago)
Just a few minutes ago my visuals went black and I couldn’t move my body I was still conscious while everything was happening but it’s happening more and more often each day
Wars Boerse (6 months ago)
I came into this video thinking fainting was the same as dying but I have learned a lot.
Markcondole (6 months ago)
One time I fainted in my room and it sort of felt like I was teleported into my kitchen, and yet some what feeling my self flailing on the floor. Then I woke up and was in my room and thought where the hell am I, before I then realized I had fainted. There was a tingling all over my body.
ItsAnnatjeuu (6 months ago)
Ive fainted 4 times in 4 years its so creepy
tekle khmiadshvili (6 months ago)
ItsAnnatjeuu yep it is i fainted 3 hours ago while they took my blood for test. And it is very frightening it feels like someone was choking me and i was loosing my vision
Crow's Rose (6 months ago)
I have Vasovagal syncope, also know as Neurocardiogenic syncope, also I have near syncope. Not due to seeing blood mainly of I'm too stressed it will trigger the condition and make me either pass out or nearly pass out.
Masked One (6 months ago)
I'm prone to fainting and panic attacks for no medical reason all I do know is that me and my sis both faint and have panic attacks and that both of our blood pressure is low.
L Minator X1 (6 months ago)
Vasovagovayvay whut? O_o
Girl ThatIsAGirl (6 months ago)
The only time i have ever fainted was in 7th grade. I had nothing to eat for over 24 hours and that day was the day of getting two shots. The first one I took and I was completely fine. As i closed my eyes and counted back from ten to one i passed out. It was kinda like in the movies where the protagonist has a dream and the screen goes all wavy because i passed out and when i got my conciousness back i started to see the wavy screen and i awoke
CATS1467 (6 months ago)
Just Want To Share My Story: I fainted today which is why I wanted to watch this vid. My brother was doing a blood test and I wanted to watch and support him just like he did when I had multiple blood tests. So I went in, they took out blood (obv) and it was over, but once it was over my vision started to go sandy, it was like little black grains started to come over my eyes from bottom to top and I told my dad I was gonna pass out, so he told me to go outside to get some air, but by the time I was reaching for the door handle all I could see was black, so I was telling my dad that I couldn't see anything, and he had to open the door for me and put me in a chair, but I couldn't see anything still and I kept asking him where I would sit, and so I sat down and all I was seeing was black, I could still hear and talk, but that was when my brain turned all fuzzy and it was super frustrating because I was trying to come in control, and I think my brain just shut off, and for a few seconds I was sitting in the chair thinking, doing, nothing and my eyes were ope but seeing all black but I could still hear, and I just remember feeling my dad's hand on my head, probably holding my head up, and then I just snapped back into control, and closed my eyes just put my head in my hands and breathed in and out slowly, then I think my dad thought I passed out because he was starting to help me get up to i don't know "carry" me (i'm to heavy for him tho) and I just remember opening my eyes and I could see again and I told him I was fine, and I got up by myself the instant it was over and I felt fine, no ringing in the ears, oi blurriness, no stumbling. I don't really think I "passed out" because for what I've heard it's that you just pass out and it's like sleeping, you're not aware of anything, but i don't know what happened to me today, I'm just glad I'm okay, but it's weird that while I was doing my blood tests I didn't pass out and I'm 100% sure that I didn't pass out just because they were drawing blood from my brother, because I was fine while watching him. But my dad told me that their wasn't enough oxygen in that room because it was really closed off so I don't know because my brother and my dad were fine. What was bad was that there were a lot of people out there when I "passed out" and I "passed out" in front of them (i'm putting quotation marks around passed out cuz I don't think I actually did just that) but like I said earlier I'm just glad I'm okay. Edit: I didn't eat breakfast that morning so I don't know and the doctor says I have low blood sugar
Pretty Lele (6 months ago)
Once I burned my oesophagus eating mashpatatoes that berly came out , smoke coming out and everything (Ik I was dumb for that) but I felt a very very bad chest pain like as my heart was beating very fast , next thing Ik my friend is shaking me asking if I’m okay I literally felt like I was in a deep sleep I was so confused when I saw I was at school but I woke seeing like a tunnel and and hearing a wierd noise and everything was grey and fuzzy , I’ve never experienced a faint so I was so confused and got scared
Samantha Goldstein (7 months ago)
The only time I ever fainted was when I had a fever and chills and I got up really fast from a chair to get to my bedroom. All I remember is walking 2 steps to my room and then blackness. I woke up almost right after with my face in my arm, which cushioned my head but also broke my glasses. One of the weirdest experiences I ever had. Thanks for the video!
Mohammed Ali (7 months ago)
This man knowledgeable and makes me enjoy learning.
okxyNicole (7 months ago)
i pass out alot, i have vasiel vaga however u felt like passing out today so tommorow i'm going to the doctar they are going to see if i have aniema
niox louis (7 months ago)
I just got a rock off my head so iam feeling sick so I watching this
Bizzle's paws (7 months ago)
Today i fainted and i hit my friend's head. And she got an head ache
Pizaa (7 months ago)
I almost did today while altar serving... I went to the change room in the middle of the Eucharist.. Staff member called my mom then the paramedics.... I’m okay now
Jacy Spence (7 months ago)
I just passed out
Sparkly Unicorn (7 months ago)
I've fainted once and I was alone. It sucked.
j elle (7 months ago)
When you black out, are you normally still, idk how to explain it, but conscious?? I have bradycardia and an atrial septal defect which means sometimes my blood pressure drops and i faint, but I’m always still AWARE of what’s going on even if i can’t see/my ears are ringing. Anyone a doctor? LOL
Janelle Angela Siy (7 months ago)
What? Syncope is pronounced as syncopee. Wow. Ive been pronouncing it wrong all the time. Hehe
kyle cresswell (7 months ago)
I fainted on Friday i hit my head on this metal machine. I just went all of a sudden. I was out for 15 minutes. Can anyone explain this?
Datmeme 123 (7 months ago)
Currently I feel like fainting so f@©k
I passed out at my cousins wedding... I was a bridesmaid and I blacked out during the ceremony. It wasn’t fun -.-
Abdullah Mohamed (7 months ago)
This is happening to me from intense pain or seeing blood or wound too close
Dreamer_365 (7 months ago)
I fainted once because I locked my knees 😅
ForestHeart ServicePack (7 months ago)
So this is why I faint when having major anxiety... Hm...
ult yiens (7 months ago)
I've fainted about 11 times . I'm literally 13
GCAT01 Living (7 months ago)
What about heat stroke? What physiologically happens then to make people faint? Also, is it the fight or flight response that kicks in when someone faints from hearing bad news or seeing something disturbing? Wish you would have gone a little deeper with this question.

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